South African prop Mujati, who has won 12 caps for the Springboks, has established himself as part of a fearsome Northampton front row alongside Soane Tonga'uiha and England hooker Dylan Hartley. And hooker Sharman has proved himself a capable understudy to Hartley, currently closing in on 50 first-team appearances.

"It is massively important that we have a squad full of quality, and Brian and Brett have shown they have what it takes to compete at the top end of the Premiership," said Saints rugby director Jim Mallinder.

"They have both improved a lot as players over the past year, and their performances reflect the work they have put in off the field. But they are still young men and we believe they have their best years in front of them, and we're delighted that they will be spending them at Franklin's Gardens."

Mujati was delighted to agree a new deal and hopes to help propel the Saints to success this season. "I've been made to feel very welcome by everyone at the club and in the town," said Mujati. "I'm certainly happy to sign on again with the Saints. We have had some success but we're still improving as a squad and I'm sure that there will be more to come in the near future."

And English-qualified Sharman was equally happy to put pen to paper on a new deal. "It was a very easy decision to sign again," he said. "The club's going in the right direction and I want to be a part of that in the future. The coaches have taught me a lot since I've been here and it seems to be paying off now, and hopefully this will continue in the future."